Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is: www.khanjun.edu
I ran this command: certbot --apache
It produced this output: Failed authorization procedure. www.khanjun.edu (http-01): urn: ietf:params:acme:error:dns :: DNS Problem: ...(Title)
My web server is (include version):apache2 .4.38
The operating system my web server runs on is (include version):Debian 10
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don't know): yes
I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): 0.31.0